Inspection must not be provided under sections 31A.01 to 31A.16 at an establishment for the slaughter of animals or the preparation of carcasses or parts or products of animals which are not intended for use as human food. Before they are offered for sale or transportation in intrastate commerce, those articles must be denatured or otherwise identified as prescribed by rules of the commissioner to deter their use for human food, unless they are naturally inedible by humans. No person may buy, sell, transport, offer for sale or transportation, or receive for transportation, in intrastate commerce, carcasses, parts of carcasses, poultry, poultry food products, meat, or meat food products of animals which are not intended for use as human food unless they are denatured or otherwise identified as required by the rules of the commissioner or are naturally inedible by humans.